Night mode is an automatic setting which takes advantage of the new wide-angle camera that's in the iPhone 11 and 11 Pro models. It's equipped with a larger sensor that is able to let in more light, allowing for brighter photos when the light is low.
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Apple Fixes iOS PDF Security Hole With iOS 4.0.2 and 3.2.2
Apple today released updated versions of its iOS operating system, addressing a significant security vulnerability in the way Safari handles PDF files on Apple's mobile devices. The new versions, which arrive as iOS 4.0.2 for the iPhone and iPod touch and iOS 3.2.2 for the iPad, should also disable the Web-based JailbreakMe service that first exploited the vulnerability.
Apple noted one week ago that it had developed a fix for the security hole, but did not offer a timeline for its release.